To add homework, go to Homework > Add Homework then click on Add button present at right side in homework list page, at click of this button a model will open, here select the Class, Section, Subject Group, Subject and enter Homework Date, Submission Date and you can see there is a tab for maximum marks, Attach Document (if you want to attach any file) and Description and then click on Save button.
You can view this added record in Homework List page.